1. Aggregate Drawings: ₹ 30,000 multiplied by 2 equals ₹ 60,000.
2. Mean Duration: The average period is calculated as \(\frac{6 + 3}{2 \times 12} = \frac{9}{12}\) years, reflecting withdrawals at the commencement of each semi-annual period.
3. Interest on Drawings Calculation:
\[\text{Interest} = ₹ 60,000 \times \frac{10}{100} \times \frac{9}{12} = ₹ 4,500.\]